EXFO America Inc. FTB-500-QTR 4-slot capacity Modular mainframe without batteriesWindows 8.1 Pro OS - Touchscreen, color, 800 x 600 TFT, 307 mm (12.1 in) - Storage: > 80 GB minimum HDD - Interfaces: > RJ-45 LAN 10/100/1000 Mbit/s > USB 2.0 ports (qty:4) > ExpressCard port (34 mm)